HYDRAULIC INTEGRATED CIRCUITS Page HP4 W 7 / 2017 Via Malavolti, 36 • 41122 Modena • ITALY • Phone +39 (059) 254895 • Fax +39 (059) 253512 mail: [email protected] • www.tecnord.com 4484 Boeing Drive Rockford, IL 61109 • USA • Phone +1 (815) 397-6628 • Fax +1 (815) 397-2526 mail: [email protected] • www.delta-power.com WARNING: the specifications/application data shown in our catalogs and data sheets are intended only as a general guide for the product described (herein). Any specific application should not be undertaken without independent study, evaluation, and testing for suitability. HFD SERIES PROPORTIONAL REVERSING FAN DRIVE HIC DESCRIPTION The HFD hydraulic block controls the cooling fan speed, modulating the supply pressure to the fan motor. By actuating the Pilot Operated Directional Valve, the oil flow to the motor is reversed, permitting the de-clogging of the cooling pack, increasing its efficiency and avoiding over-heating. FEATURES • Best-in-Class Pressure Drop (considering the compact overall dimensions). • Normally Closed Proportional Pressure Relief valve EE-PRB (RV) - the supply pressure decreases by increasing the current; if the current goes to zero, the fan speed goes to max (fail safe). • Reversing Pilot Valve IP-DAR43 (EV1) - Controllable both On/Off and Proportional. • Reversing Directional Valve - special design for soft reversing without anti-shock valves to protect the motor from pressure peaks. • Anti-cavitation Check on the P-line (ACV). • External pilot option (from Port M). • Version without Proportional Pressure Relief Valve available for application with Variable Displacement Pump (contact Tecnord/Delta Power for details). SCHEMATIC PERFORMANCE CURVES VALVE SPECIFICATIONS Nominal Flow A version - 20 GPM (40 LPM) B version - 40 GPM (80 LPM) Rating Operated Pressure 3650 PSI (250 bar) Minimum Pressure to pilot A version - 5 bar B version - 10 bar Coil Voltage 12V/24V PWM Dither 150Hz Coil Termination Deutsch DT04-2P Fluid Temperature Range 5° to 220°F (-15° to +105°C) Viscosity Range 3-650 cSt Oil Filtration Degree 18/15 (ISO 4406) Weight 12 lbs (5.8 kg) DR1 DR2 ACV EV1 P T A B RV Mp M PRESSURE DROP P->A->B->T Hydr.Oil 26cSt [121 SSU] @ 40°C [104°F] PRESSURE vs CURRENT (RV) Hydr.Oil 26cSt [121 SSU] @ 40°C [104°F] – 12V Coil